Been loading for 40+ years and for more calibers than I care to admit. Im going to do as suggested and fireform the cases to the chamber of my 360 #2. The folks in the know suggest I anneal the cases. after reading the various threads on annealing, I am not sure i can do it right. If i buy 25% more cases would that be better than ruining a bunch of expensive hard to find new ccases????

Annealing is not the voodoo science that some would make it out to be but a simple process that you can manage easily enough.
A simple gas torch, a battery drill and I use a socket for a case holder. A headless bolt with a small square of leather and you have all that you need.
10mm for 222 case head, 11mm for ppc, 12mm for x57 and 14mm for 404


A case that has been through the tumbler gives an easier surface to see the colour change happening on, untill you becomes familiar with the process and with the flame aimed at the neck shoulder junction it is simply a matter of watching the colour change as the slight blue comes over the shoulder and onto the case wall. I have found that it is usually about a second per mm of neck dia aprox-roughly speaking. 5 sec for my 20 cal, 6 for 6.5, 7 for 7x57-06, and 10sec's for 404. If you do the annealing in good light it is much easier to see the colour change and follow it over the case shoulder. The case can be dropped out of the socket into a steel bowl WITHOUT WATER and air cooled as done this way with only heat to the blue colour apears there is not enough heat to damage the case head.
I made a stand for my drill but find that I mainly just rest it on top as it is much quicker and I can do 100 cases in very short order. I have never overheated a case doing it this way and have some cases that have 40 firings through them with plenty more to come.

Use the torch, hold the brass near the base, turn the case with your fingers, heat the brass around the shoulder till red, when your fingers get hot drop the brass in a pan with water (opinions may vary on this). It's that simple